{"title":"An evolutionary computing approach for estimating global solar radiation","authors":"Rami Al-Hajj, A. Assi, Farhan Batch","doi":"10.1109/ICRERA.2016.7884553","DOIUrl":"https://doi.org/10.1109/ICRERA.2016.7884553","url":null,"abstract":"This paper presents a non-linear regression model based on an evolutionary computing technique namely the genetic programming for estimating solar radiation. This approach aims to estimate the best formula that represents the function for estimating the global solar radiation on horizontals with respect to the measured climatological data. First, we present a reference approach to find one global formula that models the relation among the solar radiation amount and a set of weather factors. In the second step, we present an enhanced approach that consists of multi formulas of regression in a parallel structure. The performance of the proposed approaches has been evaluated using statistical analysis measures. The obtained results were promising and comparable to those obtained by other empirical and neural models conducted by other research groups.","PeriodicalId":287863,"journal":{"name":"2016 IEEE International Conference on Renewable Energy Research and Applications (ICRERA)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116360904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A genetic algorithm for the definition of nodal load time evolutions in micro grids assessment","authors":"S. Korjani, M. Porru, A. Serpi, A. Damiano","doi":"10.1109/ICRERA.2016.7884412","DOIUrl":"https://doi.org/10.1109/ICRERA.2016.7884412","url":null,"abstract":"One of the on-going research topic in smart grid planning and assessment is the definition of suitable time evolution of load profiles in micro grids by using the information about the network topology and the available electrical measurements. This paper presents an approach for a heuristic definition of nodal load profiles in micro grids when the available measurements are not exhaustive for its state evaluation. In particular, in order to develop the preliminary micro grids assessment, a Genetic Algorithm (GA) has been employed to determine possible evolution of nodal load profiles that satisfy the power system constraints and input measurements. In order to verify the effectiveness of proposed methodology a real micro grid has been considered as case of study. The micro grid has been simulated in Digsilent and the used GA has been implemented in Matlab environment. Finally, Digsilent Programming Language (DPL) has been employed for interfacing the GA with Digsilent.","PeriodicalId":287863,"journal":{"name":"2016 IEEE International Conference on Renewable Energy Research and Applications (ICRERA)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117062953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Fotouhi, D. Auger, Tom Cleaver, N. Shateri, K. Propp, S. Longo
{"title":"Influence of battery capacity on performance of an electric vehicle fleet","authors":"A. Fotouhi, D. Auger, Tom Cleaver, N. Shateri, K. Propp, S. Longo","doi":"10.1109/ICRERA.2016.7884471","DOIUrl":"https://doi.org/10.1109/ICRERA.2016.7884471","url":null,"abstract":"In this study, the influence of electric vehicle (EV) range on overall performance of an EV fleet is analysed. Various case-studies are investigated in which the EV fleet is simulated to cover a number of target points in a typical delivery problem. A trip scheduling algorithm is proposed in order to get all target points while considering the EVs range. The critical role of EV range in performance improvement of the whole fleet is analysed and an optimum EV range is obtained with regard to the whole fleet mileage. The results demonstrate that 250 km is an optimum range for an EV fleet to work in an area of 100×100 km2. The number of target points, called task density, doesn't affect the optimum EV range very much and it can be determined only based on size of the service area. Finally, lithium-sulfur battery is discussed as a promising technology to extend EV range.","PeriodicalId":287863,"journal":{"name":"2016 IEEE International Conference on Renewable Energy Research and Applications (ICRERA)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114566234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Y. Nakanishi, T. Honda, K. Kasamura, Y. Nakashima, K. Nakano, K. Kondo, H. Higaki
{"title":"Bio-inspired shaft seal in coolant pump for electric vehicles","authors":"Y. Nakanishi, T. Honda, K. Kasamura, Y. Nakashima, K. Nakano, K. Kondo, H. Higaki","doi":"10.1109/ICRERA.2016.7884449","DOIUrl":"https://doi.org/10.1109/ICRERA.2016.7884449","url":null,"abstract":"Electric vehicles require a high-power device, such as a semiconductor power device, for their power control. Power devices have the drawback of high heat-generation. Water-cooling is an effective method for cooling these power devices. Their durability is affected by the performance of the shaft seal in the coolant pump. The shaft seal, in which a rotating shaft passes between liquid phase and gas phase, plays an important role in the separation of the two phases. For cooling power devices, a specifically designed shaft seal is required, as it is subjected to the high pressure and temperature of the coolant and the high-speed rotation of the shaft. A new-type of shaft seal has been developed using a biomimetic mechanism in which the lubrication mechanism found in natural synovial joints is adopted. A fibre-reinforced PVF (polyvinyl formal) was adopted as the hydrated seal-lip material. The hydrated seal-lip was attached to the shaft. The shaft was rotated by a servomotor at a speed of 5,000 min−1 (rpm). A LLC (long life coolant) was used as the coolant, which was diluted with distilled water at a concentration of 50%, heated to 75 °C, and pressurized to 0.3 MPa. A low leakage flow rate (less than 0.15 ml/h) was continuous and damage to the hydrated seal lip was not obvious after undergoing testing for a duration of 4,500 h. The frictional torque of the bio-inspired shaft seal was lower than that of the conventional oil seal. These results suggest that the bio-inspired shaft seal is a useful component for the water-cooling system of high-power devices.","PeriodicalId":287863,"journal":{"name":"2016 IEEE International Conference on Renewable Energy Research and Applications (ICRERA)","volume":"62 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125936067","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Control of a small wind turbine system application","authors":"A. Harrouz, I. Colak, K. Kayisli","doi":"10.1109/ICRERA.2016.7884509","DOIUrl":"https://doi.org/10.1109/ICRERA.2016.7884509","url":null,"abstract":"The small wind turbines (SWTs) provide a lot of alternative power for electrical devices. In this study, the reasons for the weak efficiency of SWTs in charge applications of batteries are investigated and suggested structures to enhance the output power of the wind turbines are discussed. The study methodology is based on defining various study cases combining structural and operational parameters of the wind energy system. This system contains a rectifier controlled by direct power control (DPC) method and a permanent magnet synchronous generator (PMSG) driven by a wind turbine. The proposed model for the PMSG, a force commutated rectifier, DC bus, a buck converter and an inverter are developed and control algorithm is performed with these components. The computation of flux level from the torque command is improved that the direct current equal to zero. The main conclusion drawn by the proposed comparative control with simulation. The simulation results show the efficiency of proposed method with a fully control system.","PeriodicalId":287863,"journal":{"name":"2016 IEEE International Conference on Renewable Energy Research and Applications (ICRERA)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128079108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Optimal control based RST controller for maximum power point tracking of wind energy conversion system","authors":"Y. Soufi, S. Kahla, M. Sedraoui, M. Bechouat","doi":"10.1109/ICRERA.2016.7884516","DOIUrl":"https://doi.org/10.1109/ICRERA.2016.7884516","url":null,"abstract":"This paper presents an LQ optimal control based RST controller for maximum power tracking in a wind energy conversion system (WECS) connected to the electrical grid through a back-to-back converter. Input-output discrete WECS model has been used to implement the input-output optimal control approach. The performance criterion has two terms: the first one is involved for maximum power tracking and the other one for the mechanical fatigue loading (control input) minimization. The obtained simulation results with the considered control and a variable wind profile show an adequate dynamic of the considered conversion system.","PeriodicalId":287863,"journal":{"name":"2016 IEEE International Conference on Renewable Energy Research and Applications (ICRERA)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128130357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
H. Siddique, Abishek R. Lakshminarasimhan, C. Odeh, R. D. De Doncker
{"title":"Comparison of modular multilevel and neutral-point-clamped converters for medium-voltage grid-connected applications","authors":"H. Siddique, Abishek R. Lakshminarasimhan, C. Odeh, R. D. De Doncker","doi":"10.1109/ICRERA.2016.7884555","DOIUrl":"https://doi.org/10.1109/ICRERA.2016.7884555","url":null,"abstract":"Battery energy storage systems (BESS) are expected to increase in the number and capacity because of the increasing share of intermittent renewable energy resources in the electrical grid. Due to the cost and nature of the BESS, they are well suited for the primary reserve to balance load fluctuations in the grid. Power-electronic converters are employed for the power exchange between the transmission or distribution grid and the BESS. Usually, the voltage of such BESS is in the low-voltage range. This dc voltage can be stepped-up to medium voltage (MV) using a high-power dc-dc converter. The MV dc voltage is then inverted using an MV inverter to couple the BESS to the MV grid. In this work two converters, namely, the modular multilevel converter (MMC) and the three-level neutral-point-clamped (3L-NPC) converter, are compared and benchmarked for their application in BESS as MV inverter. Both converters are rated for 5 MVA and are to be connected to the 10 kV distribution grid. The converters are compared in terms of the components such as the number and ratings of the semiconductor devices, the filter elements; the operational characteristics such as the components losses, the system efficiency, the harmonic content of the terminal quantities; and in terms of the investment cost.","PeriodicalId":287863,"journal":{"name":"2016 IEEE International Conference on Renewable Energy Research and Applications (ICRERA)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125916837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Low-voltage distribution network reconfiguration considering high penetration of electric vehicles #x2014; A UK case study","authors":"Z. Qiao, Jin Yang","doi":"10.1109/ICRERA.2016.7884426","DOIUrl":"https://doi.org/10.1109/ICRERA.2016.7884426","url":null,"abstract":"Network reconfiguration is one of the electricity network optimization techniques for losses reduction and load balancing by changing the open-closed status of sectionalized switches. In this paper, an application of network reconfiguration in low-voltage (LV) domestic distribution network with high penetration of electric vehicles (EVs) is presented. Firstly, high resolution time-series domestic load profiles are generated and validated with measured data at substation. Electric vehicle charging profiles at both fast and slow charging modes are modelled and produced. Then the impact of increasing penetration of EVs on the network thermal and voltage constraints is quantified. To optimize the network topology, suitable locations of newly-installed switches and their operational time are identified by branch-exchange method and exhaustive search algorithm (ESA) due to the small size of network and less potential location. The proposed approach is applied to two practical 400V LV distribution networks interconnected by underground linkboxes which are used to provide back-feeds during routine maintenances or emergency conditions. By adding new sectionalized switches, the LV network will obtain more operational flexibility and could better explore its potential for further study under Smart Grid scenarios.","PeriodicalId":287863,"journal":{"name":"2016 IEEE International Conference on Renewable Energy Research and Applications (ICRERA)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126756794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
G. Agnello, M. Caruso, V. Di Dio, R. Miceli, C. Nevoloso, C. Spataro
{"title":"Speed control of tubular linear induction motors for industrial automated applications","authors":"G. Agnello, M. Caruso, V. Di Dio, R. Miceli, C. Nevoloso, C. Spataro","doi":"10.1109/ICRERA.2016.7884522","DOIUrl":"https://doi.org/10.1109/ICRERA.2016.7884522","url":null,"abstract":"The Tubular Linear Induction Machine (TLIM) has acquired great relevance over the past years for industrial automated applications. For this purpose, the complete modeling, simulation and determination of the parameters of a TLIM is presented in this paper. In addition, the TLIM speed control for this specific application is here described. In order to verify the performances of the proposed system, a test bench has been setup and good agreement is shown from the comparison between measured and simulated results.","PeriodicalId":287863,"journal":{"name":"2016 IEEE International Conference on Renewable Energy Research and Applications (ICRERA)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125078017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Seok Young Lee, Sang Uk Park, Doh-Young Park, Chan-Yong Zun, Jaehuyk Choi, Jaewon Lim, H. Mok
{"title":"Improvement of ATO efficiency by varying slip frequency for a magnetic lévitation propulsion system using a linear induction motor","authors":"Seok Young Lee, Sang Uk Park, Doh-Young Park, Chan-Yong Zun, Jaehuyk Choi, Jaewon Lim, H. Mok","doi":"10.1109/ICRERA.2016.7884543","DOIUrl":"https://doi.org/10.1109/ICRERA.2016.7884543","url":null,"abstract":"In this paper, the possibility of energy efficiency improvement of the maglev train with variable slip operation other than constant one for the linear induction motor drive is discussed. Such novel operation pattern is considered to be plausible by applying proper operating süp to the linear induction motor when a certain acceleration/deceleration operation pattern is determined. Investigation of the relationship between normal force and tracking force has been conducted. The relationship between Süp frequency and normal force and tracking force has been studied by comparing constant süp current control and variable slip current vector control. It has provided the most efficient süp curve along with varying operation pattern after testing a band of possible süp/pattern combination. An algorithm is used to implement the variable süp control scheme. During simulation and field test, the algorithm of automatic train operation which applies the best slip curve to different operation pattern has been proved to be efficient and feasible. However, the best efficiency süp curve has to consider the influence of the change of the lévitation force since the lévitation force tend to increase along with the decreasing slip frequency. Then the ATO system select the süp curve that provide best efficicncy under constraints due to safety to conduct the field test.","PeriodicalId":287863,"journal":{"name":"2016 IEEE International Conference on Renewable Energy Research and Applications (ICRERA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124359436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}